Today, many mainframe applications are being written in languages such as Java and C. And many new applications are being written using JSON and REST APIs for the mainframe, too. Mainframes can run applications written in Python, Perl, Curl, Zowe (OSS), as well as cloud software written in Red Hat OpenShift for LinuxONE using the OpenShift Container Platform (Kubernetes). Rocket Open AppDev for Z runs on IBM z/OS.